Multicolor electrochromic device and preparation method thereof

The invention belongs to the field of electrochromism, and particularly relates to a multicolor electrochromism device and a preparation method thereof. The electrochromic composite film is introduced into a traditional electrochromic device, and the large-area patterned device display effect can be achieved. According to the electrochromic composite film prepared by the invention, the electrochromic material is printed on the photonic crystal composite substrate by adopting a silk-screen printing method, the colors of different photonic crystals can be regulated and controlled according to the sizes of the photonic crystals, and the defect that the traditional electrochromic color is single can be effectively overcome by introducing the composite photonic crystal electrochromic layer. Compared with a traditional electrochromic patterned device, the preparation of electrochromic devices with different substrates is realized through a transfer printing method. The preparation method is convenient and rapid in